YbCl3-MCln体系相图的研究(M=Li、Mg、Ca、Pb; n=1,2)

借助于DTA与X射线衍射法研究了YbCl_3-MCl_n(M=Li、Mg、Ca、Pb; n=1或2)二元体系相图．发现YbCl_3-LiCl体系相图属固液异组成型，有化合物Li_3YbCl_6生成，它在481 ℃有一相转变. 其无变点分别为x_(YbCl_s)＝0.410；526 ℃和x_(YbCl_3)=0.340，547 ℃；YbCl_3-MgCl_2属类转熔型相图，在富YbCl_3相区666 ℃有一尚不知其性质的热效应，为x_(YbCl_3)＝0.380，628 ℃；YbCl_3-CaCl_2和YbCl_3-PbCl_2体系皆属简单低共熔型相图，其低共溶点分别为x_(YbCl_3)＝0.530, 615 ℃和x_(YbCl_3)＝0.340, 415 ℃. 后者在固相下有一不稳定化合物PbYbCl_5生成，在392 ℃分解，同时探讨了相图的某些规律．

Phase Diagram of Binary Systems YbCl3-MCln(M=Li,Mg, Ca,Pb; n=1 or 2)

The Phase diagrams of binary systems YbCl_3-MCl_n(M=Li, Mg, Ca, Pb; n=1 or 2) were investigated by means of DTA and X-ray diffeaction analysis. It was found that YbCl_3-LiCl systm is of peritectic type wich compound Li_3YbCl_6 and its phase transition is at 481 ℃ as well as the invariant points E (x_(YbCl_3)=0.410, 526 ℃) and P (x_(YbCl_3)=0.340, 547 ℃) YbCl_3-MgCl_2 system is of peritectic-like type with a peritectic-like line over the YbCl_3-rich region at 666 ℃ and the peritectic compound could not be specified. Its eutectic point e is (x_(YbCl_2)=0.380, 628 ℃). YbCl_3-CaCl_2 and YbCl_3-PbCl_2 systems are of simple eutectic type with eutectic points (x_(YbCl_3)=0.530, 615 ℃) and (x_(YbCl_3)=0.340, 415 ℃) respectively. An unstable compound, formed in the solid state, is PbYbCl_5 and decomposes at 392 ℃. Some rules of the phase diagram were also expolored.